Pre determination of performance of double winding induction motor using MATLAB

Abstract

Equivalent circuit of an induction motor helps to pre determine its performance for various values of slip. Determination of equivalent circuit for Double Winding Induction Motor (DWIM) for power balancing mode of operation is attempted in this paper. This machine consists of two windings on the same stator core and a squirrel cage rotor. One set of winding is connected to a three phase supply in which the machine works as an induction motor to meet the mechanical load and a three phase EMF is developed in the other winding that works as an Induction Alternator (IA). This machine can either be operated in power balancing mode in which machines is expected to operate at its rated capacity or in maximum efficiency mode in which machine is expected to operate at load current corresponds to the maximum efficiency. For experimental verification, a 3kW, 415V, 3-phase DWIM has been designed, fabricated and tested. Equivalent circuit model has been developed using Simulink. Predetermined results are verified with direct load test. An attempt is made to develop modelling of DWIM for power balancing mode of operation.